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Metal Corrosion and the Efficiency of Corrosion Inhibitors in Less Conductive Media
Published on: November 3, 2018
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Corrosion inhibitor distribution on abrasive-blasted steels
A Krautsieder1, N Sharifi2, D C Madden2
1Department of Chemical Engineering and Biotechnology, University of Cambridge, CB3 0AS Cambridge, UK; Institute of Energy and Environmental Flows, University of Cambridge, CB3 0EZ Cambridge, UK.
Journal of Colloid and Interface Science
|December 19, 2022
Summary
Corrosion inhibitor benzotriazole (BTAH) preferentially adsorbs to steel surfaces, even in the presence of contaminants. This understanding is crucial for developing effective corrosion prevention strategies in abrasive-blasted environments.
Area of Science:
- Materials Science
- Corrosion Science
- Surface Chemistry
Background:
- Abrasive-blasted steel surfaces present a complex environment with multiple substrates.
- Contaminant substrates can adsorb corrosion inhibitors, reducing their availability and effectiveness.
- Understanding inhibitor adsorption behavior is essential for optimizing corrosion protection.
Purpose of the Study:
- To quantify the adsorption extent and strength of benzotriazole (BTAH) on various substrates found on abrasive-blasted steel.
- To determine the preferential adsorption order of BTAH on steel, iron oxide, calcium carbonate, garnet, and silica.
- To inform the development of novel corrosion inhibitor delivery methods.
Main Methods:
- Quantitative adsorption measurements of BTAH from toluene.
- Corrections for BTAH solution self-association.
- Surface analysis using X-ray photoelectron spectroscopy (XPS), sum-frequency generation spectroscopy (SFG), and quartz crystal microbalance (QCM).
Main Results:
- All tested substrates showed adsorbed BTAH layers.
- Adsorption strength order: steel > iron oxide > calcium carbonate/garnet > silica (relevant for limited BTAH).
- Adsorption plateau order: calcium carbonate/silica > iron oxide > garnet > steel (relevant for ample BTAH).
- Steel maintains a complete BTAH inhibitor monolayer even with contaminant substrate depletion.
Conclusions:
- The preferential adsorption of BTAH varies depending on its concentration and substrate type.
- Steel surfaces demonstrate strong affinity for BTAH, ensuring monolayer coverage.
- Findings support the development of in-situ corrosion inhibitor application during blasting for enhanced protection.
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